Unlucky dude! One thing to note though, I would be wary about buying feminised seeds. They have a tendency to become hermaphrodite if they are stressed. All it takes is for a timer to go bad on you and the balls will soon appear. Females from normal seeds are a lot more resistant. The best method, although it requires a little more time, is to grow say 4 plants, take a clone from each and flower the little clones under a few flouros as soon as they have started growing. Within a week you should know which of ur plants are male/female (ensure u label each clone/plant). Discard the males and then just keep back a female from the original plants. Discard the little clones and grow her on for a bit and then take as many cuttings as you want. Once they are ready to go, flower away and be gauranteed a sausage free grow room!